hwmon: (s3c-hwmon) Use a real mutex

The semaphore which protects the ADC is semantically a mutex. Use a
real mutex.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/hwmon/s3c-hwmon.c b/drivers/hwmon/s3c-hwmon.c
index 3f3f9a47acfd..05248f2d7581 100644
--- a/drivers/hwmon/s3c-hwmon.c
+++ b/drivers/hwmon/s3c-hwmon.c
@@ -51,7 +51,7 @@ struct s3c_hwmon_attr {
  * @attr: The holders for the channel attributes.
 */
 struct s3c_hwmon {
-        struct semaphore        lock;
+        struct mutex            lock;
         struct s3c_adc_client   *client;
         struct device           *hwmon_dev;
 
@@ -73,14 +73,14 @@ static int s3c_hwmon_read_ch(struct device *dev,
 {
         int ret;
 
-        ret = down_interruptible(&hwmon->lock);
+        ret = mutex_lock_interruptible(&hwmon->lock);
         if (ret < 0)
                 return ret;
 
         dev_dbg(dev, "reading channel %d\n", channel);
 
         ret = s3c_adc_read(hwmon->client, channel);
-        up(&hwmon->lock);
+        mutex_unlock(&hwmon->lock);
 
         return ret;
 }
@@ -296,7 +296,7 @@ static int __devinit s3c_hwmon_probe(struct platform_device *dev)
 
         platform_set_drvdata(dev, hwmon);
 
-        init_MUTEX(&hwmon->lock);
+        mutex_init(&hwmon->lock);
 
         /* Register with the core ADC driver. */